condition mean min max ZT0-3 472.804183 472.804183 472.804183 ZT4-7 317.594286 317.594286 317.594286 ZT8-11 347.7659145 347.7659145 347.7659145 ZT12-15 409.5441575 409.5441575 409.5441575 ZT16-19 543.963606 543.963606 543.963606 ZT20-23 492.9237775 492.9237775 492.9237775